Miori Motomiya is a supporting female character in Haibara's Teenage New Game+ and a member of the popular social circle within Natsuki Haibara's high school class. She has been Natsuki's childhood friend since their kindergarten days; they remained close through elementary school but became distant during middle school. She is a basketball club member and a class socialite known for her friendly, approachable, and easygoing nature. She is calm and observant, often providing a grounded perspective within her friend group, and she possesses sharp observational insight that she uses to support Natsuki's plans with well-aimed advice. Miori is highly sociable and comfortable interacting with both her close friends and classmates, making her a natural fit in the popular circle. She is part of the core trio of girls alongside Hikari Hoshimiya and Uta Sakura, and she maintains a respectful and increasingly friendly rapport with Natsuki after their reunion in high school. Her motivations include reconnecting with Natsuki and developing her own social standing; she also takes an interest in Reita Shiratori and asks Natsuki for help getting to know him. In the story, Miori serves as a bridge between different personalities in the classroom and uses her perceptiveness to support Natsuki's Rainbow Youth Project. Her development centers on finding her own voice and place within a group of strong personalities, gradually becoming more confident in her role among her friends. Miori has long black hair and blue eyes, often seen in a ponytail and school uniform, and her notable abilities include strong athletic skill in basketball and excellent communication skills.